- Khan academy, ironically enough, is difficult for IN SCHOOL use because all schools implement youtube restricted filtering to protect students against the near pornographic content, gun violence and suicide videos that infect youtube. With youtube restricted filtering it requires you to log into youtube so youtube can tell if you are a minor (a student) and enforce safe search (or tell if you are a teacher with relaxed access). Khan academy links all their videos to youtube BUT purposely does so in a way that makes the user look anonymous so there is no way for the restricted filter setting to tell who you are. When this happens the videos break. Here is an example of this URL (notice no-cookies url. Your youtube login is held in a cookie. If you use the no cookies url youtube ignores your cookies which means its ignoring/not passing your login) https://www.youtube-nocookie.com/embed/vIdMgO-tfyE/?controls=1&enablejsapi=1&modestbranding=1&showinfo=0&origin=https%3A%2F%2Fwww.khanacademy.org&iv_load_policy=3&html5=1&autoplay=0&fs=1&rel=0&hl=en&cc_lang_pref=en&cc_load_policy=1&start=0
This is a method Khan Academy chose for some mysterious reason (possibly to make their site anonymous for those that use it). This is what is breaking Khan academy videos and requiring that we dig out the URLs and make them "youtube restricted filter friendly" for schools.
When sites like Khan Academy link YouTube videos, they will not be viewable:
View source, get the YouTube link, give it to whoever needs it and do not try to get it to work on their computer through the linking site. It is and always will be a waste of time.
To view the URL of the video player you have to use the inspect element of Chrome and hover over the video player. In the right box you will find (if you expand an arrow) the no-cookies url for youtube.